/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.segi.view.zxing.view;

import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.segi.view.R;
import com.segi.view.zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder rectangle and partial
 * transparency outside it, as well as the laser scanner animation and result points.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class ViewfinderView extends View {

  private static final long ANIMATION_DELAY = 80L;
  private static final int CURRENT_POINT_OPACITY = 0xA0;
  private static final int MAX_RESULT_POINTS = 20;
  private static final int POINT_SIZE = 6;

  private CameraManager cameraManager;
  private final Paint paint;
  private Bitmap resultBitmap;
  private final int maskColor;
  private final int resultColor;
//  private final int laserColor;
  private final int resultPointColor;
  private int cornerColor;
  private List<ResultPoint> possibleResultPoints;
  private List<ResultPoint> lastPossibleResultPoints;
  /**
   * 是否显示扫描点
   */
  private boolean showResultPoints;
  /**
   * 用于中间滑动线
   */
  private Bitmap mLineBitmap;
  private Rect mDst = new Rect();// 屏幕

  // This constructor is used when the class is built from an XML resource.
  public ViewfinderView(Context context, AttributeSet attrs) {
    super(context, attrs);

    // Initialize these once for performance rather than calling them every time in onDraw().
    paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    Resources resources = getResources();
    maskColor = resources.getColor(R.color.viewfinder_mask);
    resultColor = resources.getColor(R.color.result_view);
    resultPointColor = resources.getColor(R.color.possible_result_points);
    cornerColor = resources.getColor(R.color.viewfinder_corner);
    possibleResultPoints = new ArrayList<ResultPoint>(5);
    lastPossibleResultPoints = null;
    
    mLineBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.orcode_scan_line);
  }

  public void setCameraManager(CameraManager cameraManager) {
    this.cameraManager = cameraManager;
  }

  @SuppressLint("DrawAllocation")
  @Override
  public void onDraw(Canvas canvas) {
    if (cameraManager == null) {
      return; // not ready yet, early draw before done configuring
    }
    Rect frame = cameraManager.getFramingRect();
    Rect previewFrame = cameraManager.getFramingRectInPreview();    
    if (frame == null || previewFrame == null) {
      return;
    }
    int width = canvas.getWidth();
    int height = canvas.getHeight();
    
    int linewidht = 7;
    int linelength = 35;
    paint.setColor(cornerColor);
    //左上角
    canvas.drawRect(frame.left, frame.top,linewidht + frame.left, linelength + frame.top, paint);
    canvas.drawRect(frame.left, frame.top, linelength + frame.left, linewidht + frame.top, paint);
    //右上角
    canvas.drawRect(- linewidht + frame.right, frame.top, 1 + frame.right, linelength + frame.top, paint);
    canvas.drawRect(-linelength + frame.right, frame.top, frame.right,linewidht + frame.top, paint);
    //左下角
    canvas.drawRect(frame.left, -linelength-1 + frame.bottom, linewidht + frame.left, 1 + frame.bottom,    paint);
    canvas.drawRect(frame.left, - linewidht + frame.bottom, linelength + frame.left, 1 + frame.bottom, paint);
    //右下角
    canvas.drawRect(- linewidht + frame.right, -linelength-1 + frame.bottom, 1 + frame.right, 1 + frame.bottom, paint);
    canvas.drawRect(-linelength + frame.right, - linewidht + frame.bottom, frame.right, 1 + frame.bottom, paint);

    // Draw the exterior (i.e. outside the framing rect) darkened
    paint.setColor(resultBitmap != null ? resultColor : maskColor);
    canvas.drawRect(0, 0, width, frame.top, paint);
    canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
    canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
    canvas.drawRect(0, frame.bottom + 1, width, height, paint);

    if (resultBitmap != null) {
      // Draw the opaque result bitmap over the scanning rectangle
      paint.setAlpha(CURRENT_POINT_OPACITY);
      canvas.drawBitmap(resultBitmap, null, frame, paint);
    } else {

      // Draw a red "laser scanner" line through the middle to show decoding is active
//      paint.setColor(laserColor);
//      int middle = frame.height() / 2 + frame.top;
//      canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint);
      paint.setAlpha(255);
      int spacingSize = mLineBitmap.getHeight() * 2;
      if (mDst.top == 0 || mDst.top+3 >= frame.height() + frame.top - spacingSize) {
		 mDst.top = frame.top + spacingSize;
	  }else{
		 mDst.top += spacingSize;
	  }
	  mDst.left = frame.left;
	  mDst.right = frame.right;
	  mDst.bottom = mDst.top + mLineBitmap.getHeight();
	  canvas.drawBitmap(mLineBitmap, null, mDst, paint);
    	
      if (showResultPoints) {
    	  float scaleX = frame.width() / (float) previewFrame.width();
    	  float scaleY = frame.height() / (float) previewFrame.height();
    	  
    	  List<ResultPoint> currentPossible = possibleResultPoints;
    	  List<ResultPoint> currentLast = lastPossibleResultPoints;
    	  int frameLeft = frame.left;
    	  int frameTop = frame.top;
    	  if (currentPossible.isEmpty()) {
    		  lastPossibleResultPoints = null;
    	  } else {
    		  possibleResultPoints = new ArrayList<ResultPoint>(5);
    		  lastPossibleResultPoints = currentPossible;
    		  paint.setAlpha(CURRENT_POINT_OPACITY);
    		  paint.setColor(resultPointColor);
    		  synchronized (currentPossible) {
    			  for (ResultPoint point : currentPossible) {
    				  canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
    						  frameTop + (int) (point.getY() * scaleY),
    						  POINT_SIZE, paint);
    			  }
    		  }
    	  }
    	  if (currentLast != null) {
    		  paint.setAlpha(CURRENT_POINT_OPACITY / 2);
    		  paint.setColor(resultPointColor);
    		  synchronized (currentLast) {
    			  float radius = POINT_SIZE / 2.0f;
    			  for (ResultPoint point : currentLast) {
    				  canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX),
    						  frameTop + (int) (point.getY() * scaleY),
    						  radius, paint);
    			  }
    		  }
    	  }
	  }

      // Request another update at the animation interval, but only repaint the laser line,
      // not the entire viewfinder mask.
      postInvalidateDelayed(ANIMATION_DELAY,
                            frame.left - POINT_SIZE,
                            frame.top - POINT_SIZE,
                            frame.right + POINT_SIZE,
                            frame.bottom + POINT_SIZE);
    }
  }

  public void drawViewfinder() {
    Bitmap resultBitmap = this.resultBitmap;
    this.resultBitmap = null;
    if (resultBitmap != null) {
      resultBitmap.recycle();
    }
    invalidate();
  }

  /**
   * Draw a bitmap with the result points highlighted instead of the live scanning display.
   *
   * @param barcode An image of the decoded barcode.
   */
  public void drawResultBitmap(Bitmap barcode) {
    resultBitmap = barcode;
    invalidate();
  }

  public void addPossibleResultPoint(ResultPoint point) {
	if (showResultPoints) {
		List<ResultPoint> points = possibleResultPoints;
		synchronized (points) {
			points.add(point);
			int size = points.size();
			if (size > MAX_RESULT_POINTS) {
				// trim it
				points.subList(0, size - MAX_RESULT_POINTS / 2).clear();
			}
		}
	}
  }
  
  /**
   * 设置是否显示扫描点
   * @param isShow
   */
  public void setShowResultPoints(boolean isShow)
  {
	  showResultPoints = isShow;
  }
  
  /**
   * 替换扫描线
   */
  public void setLineBitmap(Bitmap line)
  {
	  mLineBitmap = line;
  }
  
  /**
   * 四个角的颜色
   * @param orgColorId
   */
  public void setOrgColor(int orgColorId)
  {
	  cornerColor = orgColorId;
  }
  

}
